Answer:
280 mL
Explanation:
Ideal gas law:
PV = nRT
Rearranging:
V / T = nR / P
At constant pressure:
V₁ / T₁ = V₂ / T₂
Substituting values:
250 / (15 + 273) = V / (45 + 273)
V = 276
Rounded to two significant figures, the volume will be 280 mL.
When using the ideal gas law, remember to always use absolute units for temperature, like Kelvin.
Answer:
I predict the reaction between __Fe___ and __CuSO___ will yield a _____single replacement_____ reaction/s.
I predict the reaction between ___ Pb(NO3)2__ and __ Kl___ will yield a _____ double replacement_____ reaction/s.
I predict the reaction between ___Mg__ and __HCI___ will yield a ____Single replacement______ reaction/s.
I predict the reaction between __ electrolysis___ and _____ will yield a ____ decomposition______ reaction/s.
I predict the reaction between __ Mg___ and __ O2___ will yield a ____ synthesis and inorganic combustion______ reaction/s.
Explanation:
Alkane have the empirical formula of c3h8
We can measure the properties of several unknown solids by some of the characteristics :
Covalent.
Ionic.
Metallic.
Network covalent.
<span>covalent bonds are weaker than ionic and create molecular compounds. these have low melting and boiling points.
</span>
<span>ionic compounds are very strong bonds, it takes a lot of energy to melt and boil these compounds. these are brittle compounds.
</span>metallic bonds are found in metals, of course. these are described as "sea of electrons" because the valence elctrons of each metal atom can freely move between the metal atoms in the crystal. this is what allows for electric conductivity in metals, the easy flow of electrons through the metal.
<span>network covalent are covalent bonds. the are different from covalent bonds because they are much stronger bonds. a diamond is made only of C. one sees in other compounds that carbon bonds are covalent and weaker than ionic. in a diamond, the C atoms are in a network of covalent bonds and, as we see everyday, graphite, also only carbon, is so weakly held together that we can rub the tip of a pencil and the C comes off on our hands</span>
Answer:
mass of oxygen gas in Kg = 15.0Kg
Explanation:
Volume of air in the room = 4.0m*5.0m*2.5m = 50m³
volume of oxygen in the room = 21/100 * 50m³ = 10.5m³
using the ideal gas equation; PV=nRT
number of moles of oxygen gas, n = PV/RT
At STP, P = 1atm, V = 10.5m³ = (10.5*1000)dm³ = 10500dm³, R = 0.082 atmdm³K⁻¹mol⁻¹, T = 273K
n = 1 * 10500/ (273 *0.082)
n = 469.04 moles
mass of oxygen gas in Kg = (no of moles * molar mass)/1000
molar mass of oxygen gas = 32g
mass of oxygen gas in Kg = (469.04 * 32)/1000
mass of oxygen gas in Kg = 15.0Kg